315 lines
11 KiB
OCaml
315 lines
11 KiB
OCaml
open Pdfutil
|
|
|
|
type colspec =
|
|
NoCol
|
|
| RGB of float * float * float
|
|
| Grey of float
|
|
| CYMK of float * float * float * float
|
|
|
|
type drawops =
|
|
| Rect of float * float * float * float
|
|
| Bezier of float * float * float * float * float * float
|
|
| To of float * float
|
|
| Line of float * float
|
|
| ClosePath
|
|
| SetFill of colspec
|
|
| SetStroke of colspec
|
|
| SetLineThickness of float
|
|
| SetLineCap of int
|
|
| SetLineJoin of int
|
|
| SetMiterLimit of float
|
|
| SetDashPattern of float list * float
|
|
| Matrix of Pdftransform.transform_matrix
|
|
| Push
|
|
| Pop
|
|
| Fill
|
|
| FillEvenOdd
|
|
| Stroke
|
|
| FillStroke
|
|
| FillStrokeEvenOdd
|
|
| Clip
|
|
| ClipEvenOdd
|
|
| FormXObject of float * float * float * float * string * drawops list
|
|
| Use of string
|
|
| ImageXObject of string * Pdf.pdfobject
|
|
| Image of string
|
|
| NewPage
|
|
| Opacity of float
|
|
| SOpacity of float
|
|
| Font of Pdftext.standard_font * float
|
|
| BT
|
|
| ET
|
|
| Text of string
|
|
| SpecialText of string
|
|
| Newline
|
|
| Leading of float
|
|
| CharSpace of float
|
|
| WordSpace of float
|
|
| TextScale of float
|
|
| RenderMode of int
|
|
| Rise of float
|
|
| URL of string
|
|
| EndURL
|
|
|
|
(* Per page resources *)
|
|
type res =
|
|
{images : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
|
|
extgstates : ((string * float), string) Hashtbl.t; (* (kind, value), name *)
|
|
fonts : (Pdftext.font, (string * int)) Hashtbl.t; (* (font, (objnum, pdf name)) *)
|
|
form_xobjects : (string, (string * int)) Hashtbl.t; (* (name, (pdf name, objnum)) *)
|
|
mutable page_names : string list;
|
|
mutable time : Cpdfstrftime.t;
|
|
mutable current_url : string option;
|
|
mutable current_font : Pdftext.font;
|
|
mutable num : int}
|
|
|
|
let empty_res =
|
|
{images = null_hash ();
|
|
extgstates = null_hash ();
|
|
fonts = null_hash ();
|
|
form_xobjects = null_hash ();
|
|
page_names = [];
|
|
time = Cpdfstrftime.dummy;
|
|
current_url = None;
|
|
current_font = Pdftext.StandardFont (Pdftext.TimesRoman, Pdftext.WinAnsiEncoding);
|
|
num = 0}
|
|
|
|
let resstack =
|
|
ref [empty_res]
|
|
|
|
let res () =
|
|
hd !resstack
|
|
|
|
let fresh_name s =
|
|
(res ()).num <- (res ()).num + 1;
|
|
s ^ string_of_int (res ()).num
|
|
|
|
(* At end of page, we keep things for which we have indirects - but ExtGStates
|
|
aren't indirect, so they go. *)
|
|
let reset_state () =
|
|
Hashtbl.clear (res ()).extgstates;
|
|
(res ()).page_names <- []
|
|
|
|
let process_specials pdf endpage filename bates batespad num page s =
|
|
let pairs =
|
|
Cpdfaddtext.replace_pairs pdf endpage None filename bates batespad num page
|
|
in
|
|
Cpdfaddtext.process_text (res ()).time s pairs
|
|
|
|
let charcodes_of_utf8 s =
|
|
implode (map char_of_int (option_map (Pdftext.charcode_extractor_of_font_real (res ()).current_font) (Pdftext.codepoints_of_utf8 s)))
|
|
|
|
let extgstate kind v =
|
|
try Hashtbl.find (res ()).extgstates (kind, v) with
|
|
Not_found ->
|
|
let n = fresh_name "/gs" in
|
|
Hashtbl.add (res ()).extgstates (kind, v) n;
|
|
n
|
|
|
|
let rec ops_of_drawop pdf endpage filename bates batespad num page = function
|
|
| Push -> [Pdfops.Op_q]
|
|
| Pop -> [Pdfops.Op_Q]
|
|
| Matrix m -> [Pdfops.Op_cm m]
|
|
| Rect (x, y, w, h) -> [Pdfops.Op_re (x, y, w, h)]
|
|
| Bezier (a, b, c, d, e, f) -> [Pdfops.Op_c (a, b, c, d, e, f)]
|
|
| To (x, y) -> [Pdfops.Op_m (x, y)]
|
|
| Line (x, y) -> [Pdfops.Op_l (x, y)]
|
|
| SetFill x ->
|
|
begin match x with
|
|
| RGB (r, g, b) -> [Op_rg (r, g, b)]
|
|
| Grey g -> [Op_g g]
|
|
| CYMK (c, y, m, k) -> [Op_k (c, y, m, k)]
|
|
| NoCol -> []
|
|
end
|
|
| SetStroke x ->
|
|
begin match x with
|
|
| RGB (r, g, b) -> [Op_RG (r, g, b)]
|
|
| Grey g -> [Op_G g]
|
|
| CYMK (c, y, m, k) -> [Op_K (c, y, m, k)]
|
|
| NoCol -> []
|
|
end
|
|
| ClosePath
|
|
| Fill -> [Pdfops.Op_f]
|
|
| FillEvenOdd -> [Pdfops.Op_f']
|
|
| Stroke -> [Pdfops.Op_S]
|
|
| FillStroke -> [Pdfops.Op_B]
|
|
| FillStrokeEvenOdd -> [Pdfops.Op_B']
|
|
| Clip -> [Pdfops.Op_W; Pdfops.Op_n]
|
|
| ClipEvenOdd -> [Pdfops.Op_W']
|
|
| SetLineThickness t -> [Pdfops.Op_w t; Pdfops.Op_n]
|
|
| SetLineCap c -> [Pdfops.Op_J c]
|
|
| SetLineJoin j -> [Pdfops.Op_j j]
|
|
| SetMiterLimit m -> [Pdfops.Op_M m]
|
|
| SetDashPattern (x, y) -> [Pdfops.Op_d (x, y)]
|
|
| FormXObject (a, b, c, d, n, ops) -> create_form_xobject a b c d pdf endpage filename bates batespad num page n ops; []
|
|
| Use n ->
|
|
let pdfname = try fst (Hashtbl.find (res ()).form_xobjects n) with _ -> Cpdferror.error ("Form XObject not found: " ^ n) in
|
|
(res ()).page_names <- pdfname::(res ()).page_names;
|
|
[Pdfops.Op_Do pdfname]
|
|
| Image s ->
|
|
let pdfname = try fst (Hashtbl.find (res ()).images s) with _ -> Cpdferror.error ("Image not found: " ^ s) in
|
|
(res ()).page_names <- pdfname::(res ()).page_names;
|
|
[Pdfops.Op_Do pdfname]
|
|
| ImageXObject (s, obj) ->
|
|
Hashtbl.add (res ()).images s (fresh_name "/XObj", Pdf.addobj pdf obj);
|
|
[]
|
|
| NewPage -> Pdfe.log ("NewPage remaining in graphic stream"); assert false
|
|
| Opacity v -> [Pdfops.Op_gs (extgstate "/ca" v)]
|
|
| SOpacity v -> [Pdfops.Op_gs (extgstate "/CA" v)]
|
|
| URL s ->
|
|
(res ()).current_url <- Some s;
|
|
[]
|
|
| EndURL ->
|
|
(res ()).current_url <- None;
|
|
[]
|
|
| Font (s, f) ->
|
|
let font = Pdftext.StandardFont (s, Pdftext.WinAnsiEncoding) in
|
|
let (n, _) =
|
|
try Hashtbl.find (res ()).fonts font with
|
|
Not_found ->
|
|
let o = Pdftext.write_font pdf font in
|
|
let n = fresh_name "/F" in
|
|
Hashtbl.add (res ()).fonts font (n, o);
|
|
(n, o)
|
|
in
|
|
(res ()).current_font <- font;
|
|
(res ()).page_names <- n::(res ()).page_names;
|
|
[Pdfops.Op_Tf (n, f)]
|
|
| BT -> [Pdfops.Op_BT]
|
|
| ET -> [Pdfops.Op_ET]
|
|
| Text s -> [Pdfops.Op_Tj (charcodes_of_utf8 s)]
|
|
| SpecialText s ->
|
|
let s = process_specials pdf endpage filename bates batespad num page s in
|
|
[Pdfops.Op_Tj (charcodes_of_utf8 s)]
|
|
| Leading f -> [Pdfops.Op_TL f]
|
|
| CharSpace f -> [Pdfops.Op_Tc f]
|
|
| WordSpace f -> [Pdfops.Op_Tw f]
|
|
| TextScale f -> [Pdfops.Op_Tz f]
|
|
| RenderMode i -> [Pdfops.Op_Tr i]
|
|
| Rise f -> [Pdfops.Op_Ts f]
|
|
| Newline -> [Pdfops.Op_T']
|
|
|
|
and ops_of_drawops pdf endpage filename bates batespad num page drawops =
|
|
flatten (map (ops_of_drawop pdf endpage filename bates batespad num page) drawops)
|
|
|
|
(* 1. We want resources to be created locally to the xobject, not on the page so it may be shared between pages.
|
|
a. make sure none are added to the page
|
|
b. make sure we collect them and add them to the xobject *)
|
|
and create_form_xobject a b c d pdf endpage filename bates batespad num page n ops =
|
|
let data =
|
|
Pdfio.bytes_of_string (Pdfops.string_of_ops (ops_of_drawops pdf endpage filename bates batespad num page ops))
|
|
in
|
|
let obj =
|
|
Pdf.Stream
|
|
{contents =
|
|
(Pdf.Dictionary
|
|
[("/Length", Pdf.Integer (Pdfio.bytes_size data));
|
|
("/Subtype", Pdf.Name "/Form");
|
|
("/BBox", Pdf.Array [Pdf.Real a; Pdf.Real b; Pdf.Real c; Pdf.Real d])
|
|
],
|
|
Pdf.Got data)}
|
|
in
|
|
Hashtbl.add (res ()).form_xobjects n (fresh_name "/Fm", (Pdf.addobj pdf obj))
|
|
|
|
let read_resource pdf n p =
|
|
match Pdf.lookup_direct pdf n p.Pdfpage.resources with
|
|
| Some (Pdf.Dictionary d) -> d
|
|
| _ -> []
|
|
|
|
let minimum_resource_number pdf range =
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let pages_in_range =
|
|
option_map2 (fun p n -> if mem n range then Some p else None) pages (indx pages) in
|
|
let number_of_name s =
|
|
match implode (rev (takewhile (function '0'..'9' -> true | _ -> false) (rev (explode s)))) with
|
|
| "" -> None
|
|
| s -> Some (int_of_string s)
|
|
in
|
|
let resource_names_page p =
|
|
let names n =
|
|
match Pdf.lookup_direct pdf n p.Pdfpage.resources with
|
|
| Some (Pdf.Dictionary d) -> map fst d
|
|
| _ -> []
|
|
in
|
|
names "/XObject" @ names "/ExtGState" @ names "/Font"
|
|
in
|
|
match
|
|
sort
|
|
(fun a b -> compare b a)
|
|
(option_map number_of_name (flatten (map resource_names_page pages_in_range)))
|
|
with
|
|
| [] -> 0
|
|
| n::_ -> n + 1
|
|
|
|
let contains_specials drawops =
|
|
List.exists (function SpecialText _ -> true | _ -> false) drawops
|
|
|
|
let draw_single ~filename ~bates ~batespad fast range pdf drawops =
|
|
(res ()).num <- max (res ()).num (minimum_resource_number pdf range);
|
|
let endpage = Pdfpage.endpage pdf in
|
|
let pages = Pdfpage.pages_of_pagetree pdf in
|
|
let str =
|
|
if contains_specials drawops then None else Some (Pdfops.string_of_ops (ops_of_drawops pdf endpage filename bates batespad 0 (hd pages) drawops))
|
|
in
|
|
let ss =
|
|
map2
|
|
(fun n p ->
|
|
if mem n range then (match str with Some x -> x | None -> Pdfops.string_of_ops (ops_of_drawops pdf endpage filename bates batespad n p drawops)) else "")
|
|
(ilist 1 endpage)
|
|
pages
|
|
in
|
|
let pdf = ref pdf in
|
|
iter2
|
|
(fun n s ->
|
|
if mem n range then pdf := Cpdftweak.append_page_content s false fast [n] !pdf)
|
|
(ilist 1 endpage)
|
|
ss;
|
|
let pdf = !pdf in
|
|
let gss_resources = map (fun ((kind, v), n) -> (kind, Pdf.Real v)) (list_of_hashtbl (res ()).extgstates) in
|
|
let select_resources t =
|
|
option_map (fun (_, (n, o)) -> if mem n (res ()).page_names then Some (n, Pdf.Indirect o) else None) (list_of_hashtbl t)
|
|
in
|
|
let pages =
|
|
map2
|
|
(fun n p ->
|
|
if not (mem n range) then p else
|
|
let new_resources =
|
|
let update = fold_right (fun (k, v) d -> add k v d) in
|
|
let new_gss = update gss_resources (read_resource pdf "/ExtGState" p) in
|
|
let new_xobjects = update (select_resources (res ()).form_xobjects @ select_resources (res ()).images) (read_resource pdf "/XObject" p) in
|
|
let new_fonts = update (select_resources (res ()).fonts) (read_resource pdf "/Font" p) in
|
|
let add_if_non_empty dict name newdict =
|
|
if newdict = Pdf.Dictionary [] then dict else
|
|
Pdf.add_dict_entry dict name newdict
|
|
in
|
|
add_if_non_empty
|
|
(add_if_non_empty
|
|
(add_if_non_empty p.Pdfpage.resources "/XObject" (Pdf.Dictionary new_xobjects))
|
|
"/ExtGState"
|
|
(Pdf.Dictionary new_gss))
|
|
"/Font"
|
|
(Pdf.Dictionary new_fonts)
|
|
in
|
|
{p with resources = new_resources})
|
|
(ilist 1 endpage)
|
|
(Pdfpage.pages_of_pagetree pdf)
|
|
in
|
|
Pdfpage.change_pages true pdf pages
|
|
|
|
let draw ~filename ~bates ~batespad fast range pdf drawops =
|
|
(res ()).time <- Cpdfstrftime.current_time ();
|
|
let pdf = ref pdf in
|
|
let range = ref range in
|
|
let chunks = ref (split_around (eq NewPage) drawops) in
|
|
while !chunks <> [] do
|
|
reset_state ();
|
|
pdf := draw_single ~filename ~bates ~batespad fast !range !pdf (hd !chunks);
|
|
chunks := tl !chunks;
|
|
if !chunks <> [] then begin
|
|
let endpage = Pdfpage.endpage !pdf in
|
|
pdf := Cpdfpad.padafter [endpage] !pdf;
|
|
range := [endpage + 1]
|
|
end
|
|
done;
|
|
!pdf
|